#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
using namespace std;
#define int long long
#define nl '\n'
#define io ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
mt19937 rng((unsigned)chrono::steady_clock::now().time_since_epoch().count());
const int mod = 1000000007, mod2 = 998244353;
// change this
const int N = 200005;
int n, arr[N], pf[N], sf[N], ans = 1e18;
signed main() {
io;
cin >> n;
for (int i=0; i<n; i++) cin >> arr[i];
for (int i=1; i<n; i++) {
// calculate prefix
pf[i] = pf[i-1];
if (arr[i-1] < arr[i]) continue;
pf[i] += arr[i-1] - arr[i] + 1;
} // pf[i]: number of operations to make 1...i strictly increasing
for (int i=n-2; i>=0; i--) {
// calculate suffix
sf[i] = sf[i+1];
if (arr[i] > arr[i+1]) continue;
sf[i] += arr[i+1] - arr[i] + 1;
} // sf[i]: number of operations to make i...n strictly decreasing
for (int i=0; i<n; i++) {
ans = min(ans, max(pf[i], sf[i]));
}
cout << ans << nl;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
364 KB |
Output is correct |
| 2 |
Correct |
1 ms |
364 KB |
Output is correct |
| 3 |
Correct |
1 ms |
364 KB |
Output is correct |
| 4 |
Correct |
1 ms |
364 KB |
Output is correct |
| 5 |
Correct |
1 ms |
364 KB |
Output is correct |
| 6 |
Correct |
1 ms |
364 KB |
Output is correct |
| 7 |
Correct |
1 ms |
364 KB |
Output is correct |
| 8 |
Correct |
1 ms |
364 KB |
Output is correct |
| 9 |
Correct |
1 ms |
364 KB |
Output is correct |
| 10 |
Correct |
1 ms |
364 KB |
Output is correct |
| 11 |
Correct |
1 ms |
364 KB |
Output is correct |
| 12 |
Correct |
1 ms |
364 KB |
Output is correct |
| 13 |
Correct |
1 ms |
364 KB |
Output is correct |
| 14 |
Correct |
1 ms |
364 KB |
Output is correct |
| 15 |
Correct |
1 ms |
364 KB |
Output is correct |
| 16 |
Correct |
1 ms |
364 KB |
Output is correct |
| 17 |
Correct |
1 ms |
364 KB |
Output is correct |
| 18 |
Correct |
1 ms |
364 KB |
Output is correct |
| 19 |
Correct |
1 ms |
364 KB |
Output is correct |
| 20 |
Correct |
1 ms |
364 KB |
Output is correct |
| 21 |
Correct |
1 ms |
364 KB |
Output is correct |
| 22 |
Correct |
1 ms |
364 KB |
Output is correct |
| 23 |
Correct |
1 ms |
364 KB |
Output is correct |
| 24 |
Correct |
1 ms |
364 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
364 KB |
Output is correct |
| 2 |
Correct |
1 ms |
364 KB |
Output is correct |
| 3 |
Correct |
1 ms |
364 KB |
Output is correct |
| 4 |
Correct |
1 ms |
364 KB |
Output is correct |
| 5 |
Correct |
1 ms |
364 KB |
Output is correct |
| 6 |
Correct |
1 ms |
364 KB |
Output is correct |
| 7 |
Correct |
1 ms |
364 KB |
Output is correct |
| 8 |
Correct |
1 ms |
364 KB |
Output is correct |
| 9 |
Correct |
1 ms |
364 KB |
Output is correct |
| 10 |
Correct |
1 ms |
364 KB |
Output is correct |
| 11 |
Correct |
1 ms |
364 KB |
Output is correct |
| 12 |
Correct |
1 ms |
364 KB |
Output is correct |
| 13 |
Correct |
1 ms |
364 KB |
Output is correct |
| 14 |
Correct |
1 ms |
364 KB |
Output is correct |
| 15 |
Correct |
1 ms |
364 KB |
Output is correct |
| 16 |
Correct |
1 ms |
364 KB |
Output is correct |
| 17 |
Correct |
1 ms |
364 KB |
Output is correct |
| 18 |
Correct |
1 ms |
364 KB |
Output is correct |
| 19 |
Correct |
1 ms |
364 KB |
Output is correct |
| 20 |
Correct |
1 ms |
364 KB |
Output is correct |
| 21 |
Correct |
1 ms |
364 KB |
Output is correct |
| 22 |
Correct |
1 ms |
364 KB |
Output is correct |
| 23 |
Correct |
1 ms |
364 KB |
Output is correct |
| 24 |
Correct |
1 ms |
364 KB |
Output is correct |
| 25 |
Correct |
1 ms |
364 KB |
Output is correct |
| 26 |
Correct |
28 ms |
5740 KB |
Output is correct |
| 27 |
Correct |
27 ms |
4972 KB |
Output is correct |
| 28 |
Correct |
27 ms |
5100 KB |
Output is correct |
| 29 |
Correct |
27 ms |
4980 KB |
Output is correct |
| 30 |
Correct |
26 ms |
4972 KB |
Output is correct |
| 31 |
Correct |
27 ms |
4972 KB |
Output is correct |
| 32 |
Correct |
26 ms |
4972 KB |
Output is correct |
| 33 |
Correct |
27 ms |
4972 KB |
Output is correct |
| 34 |
Correct |
27 ms |
4972 KB |
Output is correct |
| 35 |
Correct |
22 ms |
4972 KB |
Output is correct |
| 36 |
Correct |
23 ms |
4972 KB |
Output is correct |
| 37 |
Correct |
24 ms |
4972 KB |
Output is correct |
| 38 |
Correct |
27 ms |
4972 KB |
Output is correct |
| 39 |
Correct |
26 ms |
4972 KB |
Output is correct |
| 40 |
Correct |
28 ms |
5100 KB |
Output is correct |
| 41 |
Correct |
26 ms |
4972 KB |
Output is correct |
| 42 |
Correct |
26 ms |
4972 KB |
Output is correct |
| 43 |
Correct |
26 ms |
4972 KB |
Output is correct |
| 44 |
Correct |
26 ms |
4972 KB |
Output is correct |
| 45 |
Correct |
26 ms |
5092 KB |
Output is correct |
| 46 |
Correct |
26 ms |
4972 KB |
Output is correct |
| 47 |
Correct |
27 ms |
5100 KB |
Output is correct |
| 48 |
Correct |
26 ms |
4972 KB |
Output is correct |
